11 Mar
2007
11 Mar
'07
7:46 p.m.
From: "Tony Duell" <ard at p850ug1.demon.co.uk>
Yes, though thinking about it some more, I realized it wasn't RTS
flow control that is needed (like "reader-run"), but CTS flow control.
I don't see a simple way to implement that with what's there.
[I'm thinking that ANDing "transmit empty" from the UART and CTS
(buffered through the spare receiver in the MAX232) should work
to clock the HC74 being used to implement the "done" flop. I don't
see the gate, though -- there's a half an HC74 free, but that's
about it.]
> Does it
support hardware flow control on the console port? If not, then
[...]
It doesn't, as-shipped, though I see enough
spares in the the schematic
to implement RTS flow control.
Which owuld presumably be another 'blue wire' mod. If the use of the links is the obvious one (that is,
to select outputs of
the '4040 and feed it into some more circuitry), you could make an
external PCB with an osiccilator and divider chip on it and connect the
output to the appropriate pin on the jumper block.
Yes, that would work. One whole side of the 4x2 header used to jumper
baud rates is directly connected to the UART, so it just needs a CMOS
clock of the right frequency applied there, and the shorting block
removed altogether.
Vince